Dust catcher



2 Sheets-Sheet 2 F. R. MCGEE DUsT cATHER Filed April e, 1921' flgm March16 1926.

Patented Mar. 16, 1,926.

UNITED s'TA-Tss -r'nANK n. mona-on srnunnnvrnnn'onlo. i

DUs'r oA'rCnnnf Application fi'lea 'Aprile, 1921. sriai m458,988.

To all 'whom z't may con-oem:

Be it known 'that I, FRANK R. MoGnn, a citizen of theUnited States, andresident of Steubenville, inthe county of' Jelferson and State of Ohio,have invented certain new and useful Improvements ein Dust g Catchers,of which the following is a specification.

My invention relates to Cleaning gases, and while not limited to suchuses, more'particularly relates to the removal of finely dividedimpurities, such as coke or flue dust, or similar impurities, from blastfurnace gases, the gases evolved in the operation of by-product cokeovens, and similar appa-.

. isolating the separated impurities.

` line 111-111 of Figura 1.

A further object is to provide novel means for inducing a flow of lowpressure gases through the impurity receiving Chamber to prevent backpressure therein.

A still furtherobject of my invention is the provision of a gas Cleanerhaving the novel Constructions, arrangments and combination of partsshown in the drawings, and to be described. in detail hereinafter andparticularly pointed out in the appended Claims.

Referring now to the drawings forming part of this specification, Figure1 1s a sectional elevation showing gas Cleaning apparatus embodying the.novel features of my invention.

- Figure 2 is a side elevation of the lower portion of my Cleaner. takenat right angles to the ysectional elevation of Figure 1.

Figure 8 is a seotional plan taken on the In the accompanying drawings,the numeral 2 designates the Cylindrical outer Casingcof my Cleanerwhich is enlarged 'adj'acent its lower end forming an impurity re-Ceiving Chamber 3 and provided with a frusto-Conical bottom wall 4,having a centrally arranged discharge opening Closed -by a bell 'havinga Count'er-welghted Operating Control lever 6.

The portion o`f vthe Casing 2 abovethe impu'rity receiving Chamber 3lforms an uptake 7 for the gas to be Cleaned, which enters the impurityreceivng Chamber 3 through down- Comers '8 and 9.and vdischarges theheavier particles of impurities by gravity into the Chamber 3 before itrises through the uptake 7.

A tubular separating Chamber or member 10 is mounted within the uptakeportion of the Casing 2 and spaced from the walls thereof and has itsupper end Closed by a top 11. The upper end of the'casing 'is closed bya walll secured to the member 10 and the side walls of the Casing 2.

The separating Chamber 10 is provided adj'acent its upper end with aplurality of tangential inlet vanes '13 adapted to Cause the gasespassing from the uptake 7 into the separating Chamber to take on aCentrifugalwhirling movement, to thereby centrifugally throw out ltheimpurities in'an annular layer while expanding the gases Centripetallyto form a central Core of Cle'aned gases.

The lower end of the separating Chamber 10 extends within a secondimpurity receiving Chamber 14 having a frusto-Conical bottom 15 openingintov the lower portion of the bottom 4 of the impurity receivingChamber 3. The Chamber 14 is of greater diameter than the separatingChamber 10 and exi'tends upwardly around the separating cham'- ber 10forminga pressure relief zone 16 from which gas is drawn to prevent backpressuraf The upper end of the impurity receiving `Chamber 14;' isClosed by a wall 17.

A Clean gas Outlet 'main 18 is arranged within the lower end of theseparating Chainber 10 and spaced from the side walls thereof forming anannular trap space 19 adapted to ltrap the' annular layer of impuritiesthrown from the stream of whirling gases within the Separator and-direct said impurities into the Chamber 14. W

The outlet main 18 is adapted to receive the Central Core of Clean gasesand'conduct them to a point of use. w

The main 1,8 is, in the form of a Venturi tube, that is, it Converges tothe point 20 and -then diverges again, inthe shape of two truncatedcones joined in their smallest diameters.` The result obtained by theuse of such an outlet main is that the pressure of gas at a pointimmediately beyond the smallest diameter of the main is less than at anyother point while the gas has a higher velocity. The reasons fordesiring this low pressure area will be clearly explained below.

The outlet main 18 also acts as a choker during a slip, as during a slipthe gases entering the separating Chamber 10 will have a higher Velocityand Athe great centrifugal effect due to this increased velocitytogether' with the novel construction of the Outlet main 18 will causeconsiderable back pressure to be created adjacent to the inlet end ofthe outlet main. The' back pressure created at this point serves. as achoker on the furnace, and smooths out sudden puffs indueed by a slip,and in this way provides a uniform flow of gases beyond the point 20 inthe main 18.

An auXiliary Cleaning device 21 is located to oneside `of the main gasCleaner and has an inlet conduit 22 commnnicating with the pressurerelief zone 16 of the -impurity re- Ceiving Chamber 14. An outletCondnit- 23 for the cleaned gases leads'from 'the Cleaning device 21 tothe low pressure area of the outlet main 18, thereby establishingCommunication from the pressure relief zone 16 of the' impurityreceiving Chamber 14 through the inlet conduit 22, auxiliary Cleaner 21and Outlet conduit 23 to the outlet main 18. The gases which enter theimpurity receiving Chamber 14 with the .impurities are low in pressure,while the stream 'of Clean gases within the main 18 is of comparativelyhigh pressure. Therefore to induce a flow of the pressure gases from thepressure relief zone 16 in the impurity receiving Chamber 14 through theauxiliary cleaner 21, into the clean gas outlet main 18, it is necessaryto produce an area of low pressure, that is, pressure lower than thatwithin the pressure relief zone 16 plus the pressure loss due to thetravel of the gases through the auxiliary Cleaner 21. The novelconstruction of outlet main 18 shown and described produces the lowpressure area desired and induces the flow of gases from the pressurerelief zone 16 through the auxiliary Cleaner 21 and into the outlet main18.

The impurities cleaned from the gases within the auxiliary Cleaner' :31fall by lgravity through the conduit 25 which communicates with theimpurity receiving Chamber 3 of the main Cleaning device. A

A rotary grizzly or other tvoe of mechanieally operated screen 26 isarranged below the Connterweighted bell 5 and is enclosed within a dustand gas tight casing 27 which opens at its lower end into a pug mill 28which is also enclosed in a gas and dust roof casing 29. A dischargespout 30 leads rom the casing 27, through which particles not passingthrough the screen 26 aredischarged. The pugmill is adapted to mix theparticles of impurities that pass through the screen 26 with water andto discharge the mixture into a car 31 or the like.

The impurities discharged through the opening Controlled by the bell 5fall upon the screen 26 and the coarser particles of impurities such ascokeand the like are screened out of the mass and discharged throughvthe spout while the finer particles or dust pass through the screen andfall into the pug mill 28 and are mixed with water and discharged intothe car 31.

The counterweighted lever 6 controlling the bcll 5 is of suflicientweight to prevent the bell 5 from Operating until a predetermined amountof impurities have been dC- i posited within the Chamber 3, thus asufiicient amount of impurities is maintained within the Chamber 3 toSeal the bottom of the seeond impurity receiving Chamber 14 and preventthe fiow of unclean gases from the downcomers 8 and 9 up through thechamber 14; and into the clean gas ontlet main 18.

A looking bar 35 is'threaded into a stand 36 below the counterweightedcontrol lever 6 and is adapted to be engaged over the lever 6, when thepug mill is inoperative to prevent the hell 5 from opening to dischargeany impurities into the mill,

VVhile I have shown but one embodiment of my invention, it will 'beunderstood that various modifications may be made without departing fromthe seope of my invention as defined in the appended claims.

I claimz- 1. 'A gas Cleaner comprising an outer casing, the lowerportion of which is enlarged to form an impurity receiving Chamber andthe portion above said impurity receiving Chamber forming an uptake forthe gas to be Cleaned, a Vertical tubular Separator member arrangedcentrally within said outer casing and provided with a plurality oft-angential inlet ports at its upper end adapted to impart a whirlin'gmot'ion to the gases entering said Separator, a second impurityreceiving Chamber extendingupwardly and around the lower end of saidtubular separator, an outlet pipe of less diameter than said Separatormember having its one end extending within 'said member so as to providean annular trap space around its periphery for the escape of theimpurities separated from the gas within the separating Chamber, andmeans for inducing a flow of gas through said second impurity receivingChamber.

2. In a gas) Cleaner, a separating Chamber, means for imparting acentrifugal whirling movement to the gases entering said Chamber, animpurity receiving chambe1',a Venturi tube like clean gas outlet mainCommunicating with said separating chamber, said main having a highVelocity and low pressure area along its length, an auxiliary Cleaningdevice, a conduit communicating with said impurity receiving Chamber andsaid auxiliary Cleaning device, and a Conduit leading from saidauxiliary Cleaning device to the high Velocity and low pressure area insaid outlet main, whereby gas is iudueed to flow through said impurityreeeiving Chamber and through said auxiliary Cleaning device into saidoutlet main.

3. In a gas Cleaner, a separating Chamber, means for imparting aeentrifugal whirling movement to the gases entering said Chamber, animpurity receiving Chamber, a Venturi tube like Clean gas outlet mainCommunicating With said separating Chamber, said main having a highVelocity and low pressure area along its length, and means Communieatingwith said in'ipurity reeeiving Chamber and said high Velocity and lowpressure area in said Outlet main to provide fora flowy of gas from saidChamber into said main.

4. A gas Cleaner Comprising, an outer Casing, the lower portion of whichis enlarged to 'form an impurity receiving Chamber and the portion abovesaid impurity receiving Chamber forming an uptake for the gas to beoleaned, a Vertical tubular Separator member arranged Centrally Withinsaid outer Casing, said Separator member being provided with a pluralityof tangential inlet ports at its upper end adapted to impart a whirlingmotion to the gases entering said Separator, a second impurity reeeivingChamber arranged Centrally within said first named Chamber and extendingupwardly around the lower end of said tubular Separator, a Venturi tubelike Outlet main having its one end arranged within and spaced from saidseparating Chamber and adapted to Conduct the Clean gases from saidseparating Chamber, said tube by reason of its Shape being provided Witha highvelocity and low pressure area, an auxiliary Cleaning device, aeonduit leading from the upper portion of said second impurity receivingChamber to said auxiliary Cleaner, and a Conduit leading from saidauxiliary Cleaning device to the high Velocity and low pressure area insaid Outlet main, whereby a low pressure of gas is induced to flowthrough said impurity reoeiving Chamber and through said auxiliaryCleaning device into said outlet main. In testimony Whereof I havehereunto set my hand.

FRANK R.. MGGEE.

